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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Allocated stock-based compensation expense
Stock-based compensation expense includes incremental stock-based compensation expense and is allocated on the condensed consolidated statements of operations and comprehensive income as follows:

 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Sales and marketing
$
112,222

 
$
101,035

 
$
230,769

 
$
202,304

Product development and content
1,161,863

 
1,428,743

 
2,275,930

 
1,930,043

General and administrative
816,785

 
838,414

 
1,753,096

 
1,370,003

Total stock-based compensation expense
$
2,090,870

 
$
2,368,192

 
$
4,259,795

 
$
3,502,350
Stock option activity
A summary of stock option activity under the 2016 Stock Plan during the six months ended June 30, 2018 is as follows:

Options
 
Number of
Stock
Options
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual Life
 
Aggregate
Intrinsic Value
Outstanding at December 31, 2017
 
734,168

 
$
5.18

 
 
 
 
Granted
 
—

 
—

 
 
 
 
Exercised
 
—

 
—

 
 
 
 
Forfeited or expired
 
(248,332
)
 
5.16

 
 
 
 
Outstanding at June 30, 2018
 
485,836

 
$
5.19

 
8.6
 
$
—

Exercisable at June 30, 2018
 
272,502

 
$
5.27

 
8.6
 
$
—

A summary of stock option activity under the 2012 Plan during the six months ended June 30, 2018 is as follows:

Options
 
Number of
Stock
Options
 
Weighted-
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual Life
 
Aggregate
Intrinsic Value
Outstanding at December 31, 2017
 
3,724,892

 
$
3.07

 
 
 
 
Granted
 
—

 
—

 
 
 
 
Exercised
 
(131,051
)
 
1.77

 
 
 
 
Forfeited or expired
 
(95,867
)
 
3.49

 
 
 
 
Outstanding at June 30, 2018
 
3,497,974

 
$
3.11

 
7.3
 
$
5,301,183

Exercisable at June 30, 2018
 
2,695,101

 
$
2.75

 
6.9
 
$
4,895,933

A summary of stock option activity under the 2006 Stock Plan during the six months ended June 30, 2018 is as follows:

Options
 
Number of
Stock
Options
 
Weighted-
Average
Exercise
Price
 
Weighted Average
Remaining
Contractual Life
 
Aggregate Intrinsic
Value
Outstanding at December 31, 2017
 
1,194,081

 
$
4.08

 
 
 
 
Granted
 
—

 
—

 
 
 
 
Exercised
 
—

 
—

 
 
 
 
Forfeited or expired
 
(96,000
)
 
5.06

 
 
 
 
Outstanding at June 30, 2018
 
1,098,081

 
$
3.99

 
3.3
 
$
564,307

Exercisable at June 30, 2018
 
1,053,902

 
$
4.00

 
3.4
 
$
529,848
Weighted-average assumptions for stock option valuation
The fair value of each stock option is estimated on the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions for the six months ended June 30, 2018 and 2017:

 
Six Months Ended June 30,
 
2018
 
2017
Risk-free interest rate
—%
 
1.89%
Expected term (in years)
0
 
6.0
Expected dividend yield
—
 
—
Expected volatility
—%
 
83%
The fair value of each stock option is estimated on the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions for the three months ended June 30, 2018 and 2017:

 
Six Months Ended June 30,
 
2018
 
2017
Risk-free interest rate
—%
 
1.89%
Expected term (in years)
0
 
6.0
Expected dividend yield
—
 
—
Expected volatility
—%
 
84%
RSA activity
A summary of RSA activity under the 2016 Stock Plan during the six months ended June 30, 2018 is as follows:

RSAs
 
Number of
RSAs
 
Weighted-Average
Stock Price
Outstanding at December 31, 2017
 
1,242,250

 
$
4.62

Granted
 
—

 
—

Vested
 
(240,540
)
 
5.36

Forfeited or expired
 
(295,877
)
 
5.39

Outstanding and unvested at June 30, 2018
 
705,833

 
$
4.05

A summary of RSA activity under the 2018 Plan during the six months ended June 30, 2018 is as follows:

RSAs
 
Number of
RSAs
 
Weighted-Average
Stock Price
Outstanding at December 31, 2017
 
—

 
$
—

Granted
 
1,522,034

 
4.18

Vested
 
—

 
—

Forfeited or expired
 
—

 
—

Outstanding and unvested at June 30, 2018
 
1,522,034

 
$
4.18

A summary of RSA activity under the 2012 Plan during the six months ended June 30, 2018 is as follows:

RSAs
 
Number of
RSAs
 
Weighted-Average
Stock Price
Outstanding at December 31, 2017
 
2,292,308

 
$
3.77

Granted
 
449,500

 
2.17

Vested
 
(954,529
)
 
3.72

Forfeited or expired
 
(209,600
)
 
2.99

Outstanding and unvested at June 30, 2018
 
1,577,679

 
$
3.45
Performance share award activity
A summary of performance share awards under the 2012 Plan during the six months ended June 30, 2018 is as follows:

PSUs
 
Number of
PSUs
 
Weighted-Average
Stock Price
Outstanding at December 31, 2017
 
—

 
$
—

Granted
 
615,500

 
2.94

Vested
 
—

 
—

Forfeited or expired
 
—

 
—

Outstanding at June 30, 2018
 
615,500

 
$
2.94